Analog input module SM 331; AI 6 x TC Isolated (6ES7331‑7PE10‑0AB0)
32 A5E02398493-02, 11/2008
Diagnostics of the Analog Input SM 331; AI 6 x TC Isolated Module
Overview of diagnostics
If errors occur during commissioning or the operation phase , the diagnostic messages enable you to identify the cause. The
general diagnostic behavior of the analog input SM 331; AI 6 x TC isolated module corresponds to that of the SIMATIC S7
analog modules.
Module information in the diagnostic buffer
The AI 6 x TC module has a diagnostic buffer. Diagnostic events are stored in the diagnostic buffer in their order of
occurrence. The list entry contains the most recent event. There are nine entries in the diagnostic buffer.
Diagnostic events can be:
● Faults on a module
● Faults in the process wiring
● Error during firmware update
● Firmware update successful
● Firmware update cancelled
The AI 6 x TC module does not have its own clock. If the CPU, PROFIBUS-DP or PROFINET interface module has a clock
and time-of-day synchronization is enabled, a time stamp will be entered for each diagnostic buffer event. The accuracy of
the time stamp corresponds to the synchronization interval of the CPU, PROFIBUS-DP or PROFINET interface module
(e.g., 1S).
Diagnostic messages
The diagnostic messages for the AI 6 x TC module are listed in the
Automation System SIMATIC S7-300 Module Data
manual.
Diagnostic records
The diagnostic data of a module can be up to 24 bytes in length and consist of records 0 and 1:
● Record 0 contains system -specific diagnostic data: 4 bytes that are defined system-wide and are valid for the AI 6 x TC
module.
● Record 1 contains
– The 4 bytes of diagnostic data of an S7-300 that are also in record 0 and
– Up to 20 bytes of module class-specific diagnostic data.
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